This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The magic's in the hole!

The seamy, underground secrets of Portland's criminal past.

It's not quite as old as its Roman appearance suggests, but this piece of infrastructure served Guatemala City for centuries.

These roaring primates were considered a divine creature in the cosmology of the Maya.

This restored colonial house was once home to the botanist responsible for bringing avocados to the U.S.

Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

A collection of heirloom roses tucked in a spectacularly beautiful botanical garden on Lake Atitlan.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

For this chef, an active volcano is his oven.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

Believe it or not, the now-ubiquitous California avocado originated in Guatemala.

A swirling spectrum of stained glass dazzles visitors who enter this subway station.

The vaulted ceiling is home to a scurry of “squirrelgoyles.”

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

The stoutest tree in the world.

A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

This beautifully deceptive waterfall is something far different from what it appears to be.